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CVE-2023-53474

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: x86/MCE/AMD: Use an u64 for bank_map Thee maximum number of MCA banks is 64 (MAX_NR_BANKS), see a0bc32b3cacf ("x86/mce: Incr…

Published Oct 1, 2025CWE-190EPSS 0.16%

Overview

CVE-2023-53474 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

x86/MCE/AMD: Use an u64 for bank_map

Thee maximum number of MCA banks is 64 (MAX_NR_BANKS), see

a0bc32b3cacf ("x86/mce: Increase maximum number of banks to 64").

However, the bank_map which contains a bitfield of which banks to

initialize is of type unsigned int and that overflows when those bit

numbers are >= 32, leading to UBSAN complaining correctly:

UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/mce/amd.c:1365:38

shift exponent 32 is too large for 32-bit type 'int'

Change the bank_map to a u64 and use the proper BIT_ULL() macro when

modifying bits in there.

[ bp: Rewrite commit message. ]

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/11c58a0c1937c157dbdf82d5ab634d68c99f3098Refgit.kernel.org/stable/c/4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156Refgit.kernel.org/stable/c/67bb7521b6420d81dab7538c0686f18f7d6d09f4Refgit.kernel.org/stable/c/9669fa17287c3af2bbd4868d4c8fdd9e57f8332eRefgit.kernel.org/stable/c/a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83Refgit.kernel.org/stable/c/ba8ffb1251eb629c2ec35220e3896cf4f7b888a7

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53474?

CVE-2023-53474 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-53474?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-53474?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-53474?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53474 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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